CHAPTER 4 TROUBLESHOOTING
Confidential
4-42
(I-4) All black
Possible cause Step Check Result Remedy
Ground
contacts
1 Is the corona wire dirty? Yes Clean the corona wire
with the wire cleaner.
(2)
2 Is the corona wire broken? Yes Replace the drum
unit.
Corona failure
3 Are the charge electrodes
between the printer body and
the drum unit dirty?
Yes Clean both electrodes.
(3)
Harness
connection
4 Is the laser unit connected to
the main PCB correctly?
No Connect the harness
between the laser unit
and the main PCB
correctly.
High-voltage
power supply
PCB failure
5 Is the problem solved after
replacing the high-voltage
power supply PCB?
Yes Replace the high-
voltage power supply
PCB.
Main PCB
failure
6 Is the problem solved after
replacing the main PCB?
Yes Replace the main
PCB.
Laser unit failure 7 Is the problem solved after
replacing the laser unit?
Yes Replace the laser unit.
User Check
(1) Clean the corona wire of the drum unit.
(2) The drum unit may be damaged. Install a new drum unit.
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